In furtherance of the purposes of section 47-1 of this title, the Secretary of the Interior is authorized, notwithstanding any other provision of law, to lease lands within the El Portal administrative site for periods of not to exceed ninety-nine years to any individual, including an employee of the United States Government, to any operator of concession facilities in the park, or the administrative site, or its successor, or to any public or private corporation or organization (including a nonprofit corporation) for purposes of providing employee housing, community facilities, administrative offices, maintenance facilities, and commercial services. Such leases shall provide that if the lessee is a concessioner, corporation, or other organization (including a nonprofit corporation) such lessee may sublease the property to its employees, employees of the United States Government, or other individuals whose residence on the leased premises is solely in support of Yosemite National Park or the El Portal administrative site for terms not to exceed the remaining terms of such leases, and they shall be subject to such terms and conditions as the Secretary of the Interior may require to assure appropriate administration, protection, and development of the land for purposes incident to the provisions of facilities and services required in the operation and administration of the park: Provided, That the Secretary of the Interior shall grant such leases in consideration of payment to the United States of the fair rental value of the leased lands, as determined by him.